Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/58828
Type: Artigo de periódico
Title: RAMAN AND INFRARED-SPECTRA OF SILICA-GEL AND NIOBIUM(V) OXIDE GRAFTED ON SILICA-GEL SURFACE AND THEIR DEPENDENCE ON PRETREATMENT TEMPERATURES
Author: KAWANO, Y
DENOFRE, S
GUSHIKEM, Y
Abstract: Raman and infrared spectra are reported for silica gel with a specific surface area, S-BET, of 322 m(2) g(-1) and an average pore size diameter of 6 nm and for silica gel chemically modified with niobium(V) oxide by grafting reaction, and thermally treated at 473-1573 K. Silica gel heated at 1273 K exhibits infrared and Raman band characteristics of alpha-quartz bands, while those heated to 1473 or 1573 K show infrared and Raman bands typical of alpha-cristobalite. Raman spectra obtained for Nb2O5-SiO2 samples heated above 1273 K upon excitation with 647.1 nm radiation were distinct from the Raman spectra excited by 488.0 and 1064 nm radiation.
Subject: INFRARED SPECTROMETRY
PHOTOACOUSTIC SPECTROMETRY
RAMAN SPECTROMETRY
NIOBIUM OXIDE
SILICA GEL
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/0924-2031(94)85019-4
Date Issue: 1994
Appears in Collections:Unicamp - Artigos e Outros Documentos

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